Effects of one-year treatment with estrogens on bone mass, intestinal calcium absorption, and 25-hydroxyvitamin D-1 alpha-hydroxylase reserve in postmenopausal osteoporosis - Civitelli,R.; Agnusdei,D.; Nardi,P.; Zacchei,F.; Avioli,L.V.; Gennari,C. (Calcif Tissue Int, 1988)